# 二.lgnorePlugin

webpack 种的 IgnorePlugin 在打包时忽略本地化内容，如引入了一个插件，只用到了中文语言包，打包的时候把非中文语言包排除掉

# 1.安装

package.json

{
  "name": "2.lgnorePlugin",
  "version": "1.0.0",
  "description": "",
  "main": "webpack.config.js",
  "scripts": {
    "dev": "webpack-dev-server",
    "build": "webpack"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "@babel/core": "^7.4.0",
    "@babel/preset-env": "^7.4.2",
    "@babel/preset-react": "^7.0.0",
    "babel-loader": "^8.0.5",
    "html-webpack-plugin": "^3.2.0",
    "webpack": "^4.29.6",
    "webpack-cli": "^3.3.0",
    "webpack-dev-server": "^3.2.1"
  },
  "dependencies": {
    "jquery": "^3.3.1",
    "moment": "^2.24.0"
  }
}

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# 2.文件

src/index.js

import jquery from "jquery"
import moment from "moment"

//手动引入所需要的语言
import "moment/locale/zh-cn"
moment.locale("zh-cn")
let r = moment()
  .endOf("day")
  .fromNow()
console.log(r)

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public/index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>lgnorePlugin</title>
  </head>

  <body></body>
</html>

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# 3.配置

webpack.config.js

let path = require("path")
let HtmlWebpackPlugin = require("html-webpack-plugin")
let webpack = require("webpack")
module.exports = {
  mode: "development",
  entry: "./src/index.js",
  output: {
    filename: "bundle.js",
    path: path.resolve(__dirname, "dist"),
  },
  plugins: [
    new HtmlWebpackPlugin({
      template: "./public/index.html",
    }),
    new webpack.IgnorePlugin(/\.\/locale/, /moment/),
  ],
  module: {
    noParse: /jquery/, //不去解析jquery中的依赖库
    rules: [
      {
        test: /\.js$/,
        exclude: /node_modules/,
        include: path.resolve("src"),
        use: {
          loader: "babel-loader",
          options: {
            presets: ["@babel/preset-env", "@babel/preset-react"],
          },
        },
      },
    ],
  },
}

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# 4.运行

npm run dev

显示时间

# 5.打包

npm run build

打包文件变小

完整代码 (opens new window)

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